Hot Math How-Tos
How To: Determine whether you child is performing at grade level in math
Math is arguably the most important subject your children study in school, and making sure they're keeping up is important. If you want to determine whether you child is performing up to their grade level, watch this video. It will give you ideas for ways to test whether that is the case.
How To: Prove that the areas of diagonal-generated triangles are equal in geometry
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to demonstrate that a diagonal line drawn from one corner of a rectangle to another will generate two equivalent triangles.
How To: Find the inverse of a function in intermediate algebra
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve problems involving function inverses.
How To: Representing a number as a decimal, percent, and fraction
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to express a number as a decimal, percent and/or fraction.
How To: Describe the meaning of percent in basic mathematics
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to explain what a percentage is within the context of basic arithmetic.
How To: Work with reaction mechanisms in organic chemistry
This free video science lesson from Internet pedagogical superstar Salman Khan presents a general introduction to the concept of reaction mechanisms in organic chemistry. Whether you need help studying for that next big test or could just use a hand finishing your homework, you're sure to be well served by this video lesson. For more information, including detailed, step-by-step instructions, take a look.
How To: Use Markovnikov's rule with carbocations in organic chemistry
In this free video science lesson from Internet pedagogical superstar Salman Khan, you'll learn how to apply Markovnikov's rule to solve carbocation problems in organic chemistry. Whether you need help studying for that next big ochem test or could just use a hand finishing your homework, you're sure to be well served by this video lesson. For more information, including detailed, step-by-step instructions, take a look.
How To: Work with SN2 reactions in stereochemistry
In this free video science lesson from Internet pedagogical superstar Salman Khan, you'll learn how to handle SN2 substitution reactions in stereochemistry. Whether you need help studying for that next big test or could just use a hand finishing your homework, you're sure to be well served by this video lesson. For more information, including detailed, step-by-step instructions, take a look.
How To: Represent chiral molecules in organic chemistry
In this free video science lesson from Internet pedagogical superstar Salman Khan, you'll learn how to visualize chiral molecules in organic chemistry. Whether you need help studying for that next big test or could just use a hand finishing your homework, you're sure to be well served by this video lesson. For more information, including detailed, step-by-step instructions, take a look.
How To: Multiply two double-digit numbers with an intersecting lines method
This is an interesting trick to solving multiplication problems. It involves multiplying 2 double-digit numbers with hand drawn, crisscrossing lines.
How To: Solve the six problem solution
Solving 6 math problems using different methods is the idea behind this video. First, you make three rows of numbers vertically from 1-9. All the numbers match across for example, 1 1 1, 2 2 2, 3 3 3, and so on. Each set of numbers creates a mathematical problem who's solution is the number six. These problems require some thinking to solve. The only one that is immediately apparent is 2 2 2=6 which is, of course, 2+2+2=6, (3x3)-3=6, the square root of 4 =2. This done on all three of the four...
How To: Add inches and feet in basic arithmetic
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to sum inches and feet, expressing your result in feet.
How To: Calculate the width of a fence given its length and perimeter
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to find the width of a fence when given numbers for its length and perimeter.
How To: Convert decimeters to kilometers in basic math
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to convert between decimeters and kilometers in basic mathematics.
How To: Solve a problem that asks you to identify percent, amount and base
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve simple percent problems in basic arithmetic.
How To: Add ounces and pounds together in basic mathematics
Need how to know how to add pounds to ounces and ounces to pounds? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to sum pound and ounce weight units.
How To: Convert between pounds and ounces in basic math
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to express ounces as pounds and pounds as ounces.
How To: Solve a word problem that asks you to convert yards into miles
Want to know how to express yards as miles? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to calculate how many yards make up a mile.
How To: Convert yards to inches with simple arithmetic
In this clip, you'll learn how to convert between yards and inches by formula. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve word problems that require you to express yards as inches or in...
How To: Convert a temperature from Fahrenheit to Celsius with simple arithmetic
Looking for a thorough guide on how to convert between Fahrenheit and Celsius temperature scales? It's easy! And this clip will teach you everything you'll need to know. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials...
How To: Convert between metric units of measure in basic arithmetic
Could you use a hand tackling metric conversions? You're in luck. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to convert between metric units in basic mathematics.
How To: Convert between empirical and metric units in basic math
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to convert between US customary and metric units in basic arithmetic.
How To: Convert from gallons to quarts, pints and cups in basic math
Need to know how to express gallons in quarts, pints and cups? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to convert between gallons, quarts, pints and cups.
How To: Solve word problems involving units of weight in basic math
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve application problems involving units of weight in basic arithmetic.
How To: Understand differentiation in math
This informative video series will help you with finding your derivatives through the process of differentiation in calculus. Follow along and graph the gradient of the given curve and then solve it as you go along! Just make sure you follow along exactly!
How To: Add fractions with unlike denominators
In order to add fractions that are not alike, you will need to find the lowest common denominator. This is the least common multiple of the fractions. To add 2/3 plus 1/5, you will need to find the lowest common denominator. Here, it is best to think of all of the multiples of the denominators. If it helps, make a list. For 3, it is 3, 6, 9, 12, 15, etc. For five, the multiples are 5, 15, 20, 25, etc.
How To: Divide mixed numbers
In order to divide mixed numbers, you should change the mixed numbers into improper fractions. With the problem 5 ¼ divided by 2 3/8, you should convert both mixed fractions to improper fractions. 5 ¼ becomes 21/4, when you multiply 4 times 5 and add one. 2 3/8 becomes 19/8, when you multiply 8 times 2 and add 3.
How To: Subtract fractions with unlike denominators
In order to subtract mixed fractions, you'll need to look at the denominators carefully. If the denominators do not match, you'll need to find a common denominator. For example, 5 2/3 minus 3 4/5 do not have the same denominator. The lowest common denominator for them is 15.
How To: Calculate the unemployment rate
All you hear about on the news, the radio, and in other media sources is how the unemployment rate is high. But how do they know that? How did they get to that conclusion? Well, wonder no more! In this video you will learn what formulas you can use and other statistics to find out what the unemployment rate is.
How To: Calculate percentage growth rates
One formula that you will run into in Calculus is calculating the percentage growth rate using a logarithmic derivative, elasticity of demand, relation among elasticity of demand and also revenue. In this video you will learn the different formulas that are used, methods of solving each formula, and also the full solutions.
How To: Solve radical equations
In elementary Algebra, one of the main formulas that you will run into is solving radical equations. It sounds hard but it's really easy. "Mister A" takes you through the steps of the formula with ease and makes it easy to understand and fun! Don't forget to take notes!
How To: Calculate and use regression functions in statistical analysis
Regression functions are a vital part of statistical analysis of populations, and if you're involved in business, science, or nearly any academic field you should understand how it works. This series of videos will show you how standard regression functions, ANOVA, ordinary least squares, and everything else you need to know.
How To: Multiply Numbers by 9 Using Nothing but Your Fingers
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this free math tutorial, you'll learn how to calculate the area of a triangle by formula. In this clip, you'll learn an easy finger-counting trick for quickly calculating multiples of 9.
How To: Calculate the area of a triangle by formula
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this free math tutorial, you'll learn how to calculate the area of a triangle by formula.
How To: Remember and recite pi to eight decimal places
Looking for an easy way to impress the math geeks in your life? This brief clip from the BBC will help you memorize pi to eight decimal places without breaking a sweat through use of a simple mnemonic device: "How I wish I could calculate pi easily today." (Hint: Count the number of letters in each word.) Easy as pi(e).
How To: Calculate the optimal angle for a projectile
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this four-part installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to find the optimal angle at which to launch a projectile.
How To: Find the square root of a number in basic arithmetic
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to answer problems that require you to find the square root of a number.
How To: Find the place value of a number in a decimal number
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to answer problems that require you to find the place value of a number within a decimal.
How To: Solve an absolute value equation and graph the answer on a number line
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve an absolute value problem in algebra and graph your answer on a number line.
How To: Express a ratio as a fraction in simplest form
From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to rewrite a ratio as a fraction in its simplest form.